wondered if you guys might offer some advice a friend of a friend has offered me 2 cadence 100w valve monoblocks and a croft micro valve pre amp upgraded to super micro re tubed and modded to only one vol control i've been trold the cadence's are worth £1600 alone i've been offered these(cadence's & croft) for £1000. would this be a fair price to pay for both of these and if i was buying to sell on to make a profit what chance would i stand of making a profit?